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HT45R4U датащи(PDF) 33 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 33 Page - Holtek Semiconductor Inc |
33 / 105 page Rev. 1.10 3� �a��� 1�� �01� Rev. 1.10 33 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Programming Considerations Withintheuserprogram,oneofthefirstthingstoconsiderisportinitialisation.Afterareset,allof theI/Odataandportcontrolregisterswillbesethigh.ThismeansthatallI/Opinswilldefaultto aninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhetherpull-high selectionshavebeenchosen.Iftheportcontrolregisters,PAC,PBC,PCC,PDCandPEC,arethen programmedtosetupsomepinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalue unlesstheassociatedportdataregisters,PA,PB,PC,PDandPE,arefirstprogrammed.Selecting whichpinsareinputsandwhichareoutputscanbeachievedbyte-widebyloadingthecorrectvalues intotheappropriateportcontrolregisterorbyprogrammingindividualbitsintheportcontrol registerusingthe″SET[m].i″and″CLR[m].i″instructions.Notethatwhenusingthesebitcontrol instructions,aread-modify-writeoperationtakesplace.Themicrocontrollermustfirstreadinthe dataontheentireport,modifyittotherequirednewbitvaluesandthenrewritethisdatabacktothe outputports. PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe PowerDownMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahighto lowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis function. T1 T2 T3 T4 T1 T2 T3 T4 Wr it e to P or tR ead fr om P or t S yst em C lo ck Po rt D at a Read/Write Timing |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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